Watson described the purpose of psychology as: âTo predict, given the stimulus, what reaction will take place; or, given the reaction, state what the situation or stimulus is that has caused the reactionâ (1930, p. 11). * All behavior is learnt from the environment.
Additional tests including penetration,solubility, and ductility are made on the residue. Cutback asphalt grades and tests There are several grades for each of the three types ofcutbacks â rapid curing (RC), medium curing (MC), andslow curing, (SC). The grades include 70, 250, 800, and3000.
1 No grade adjustment is made to compensate for the stiffness of the asphalt in the RAPâ.  When 16 to 25% RAP is used: âThe selected binder grade for the new asphalt is one grade lower for both the high and low temperature stiffness than the binder grade required for a virgin asphalt.